<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>用系数 div 和 offset 申请一个 3x3 的卷积矩阵</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.imageconvolution" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imageconvolution</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">imageconvolution</span> &mdash; <span class="dc-title">用系数 div 和 offset 申请一个 3x3 的卷积矩阵</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imageconvolution-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imageconvolution</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
   , <span class="methodparam"><span class="type">array</span> <code class="parameter">$matrix</code></span>
   , <span class="methodparam"><span class="type">float</span> <code class="parameter">$div</code></span>
   , <span class="methodparam"><span class="type">float</span> <code class="parameter">$offset</code></span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Applies a convolution matrix on the image, using the given coefficient and
   offset.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imageconvolution-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    <dt>
<code class="parameter">image</code></dt>

<dd>
<p class="para">由图象创建函数(例如<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>

    
     <dt>
<code class="parameter">matrix</code></dt>

     <dd>

      <p class="para">
       A 3x3 matrix: an array of three arrays of three floats.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">div</code></dt>

     <dd>

      <p class="para">
       The divisor of the result of the convolution, used for normalization.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">offset</code></dt>

     <dd>

      <p class="para">
       Color offset.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imageconvolution-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imageconvolution-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3671">
    <p><strong>Example #1 Embossing the PHP.net logo</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$image&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatefromgif</span><span style="color: #007700">(</span><span style="color: #DD0000">'http://www.php.net/images/php.gif'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$emboss&nbsp;</span><span style="color: #007700">=&nbsp;array(array(</span><span style="color: #0000BB">2</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">),&nbsp;array(</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">),&nbsp;array(</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">imageconvolution</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$emboss</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">127</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-Type:&nbsp;image/png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">null</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">9</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/21009b70229598c6a80eef8b45bf282b-imageconvolution_emboss.png" alt="Output of example : Embossing the PHP.net logo" width="120" height="67" />
     </div>
    </div>
   </div>
   <div class="example" id="example-3672">
    <p><strong>Example #2 Gaussian blur</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$image&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">180</span><span style="color: #007700">,</span><span style="color: #0000BB">40</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Writes&nbsp;the&nbsp;text&nbsp;and&nbsp;apply&nbsp;a&nbsp;gaussian&nbsp;blur&nbsp;on&nbsp;the&nbsp;image<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">8</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'Gaussian&nbsp;Blur&nbsp;Text'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0x00ff00</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$gaussian&nbsp;</span><span style="color: #007700">=&nbsp;array(array(</span><span style="color: #0000BB">1.0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2.0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1.0</span><span style="color: #007700">),&nbsp;array(</span><span style="color: #0000BB">2.0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">4.0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2.0</span><span style="color: #007700">),&nbsp;array(</span><span style="color: #0000BB">1.0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2.0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1.0</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">imageconvolution</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$gaussian</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">16</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;Rewrites&nbsp;the&nbsp;text&nbsp;for&nbsp;comparison<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">5</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">10</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">18</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'Gaussian&nbsp;Blur&nbsp;Text'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0x00ff00</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-Type:&nbsp;image/png'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">null</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">9</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/21009b70229598c6a80eef8b45bf282b-imageconvolution_gaussian.png" alt="Output of example : Gaussian blur" width="180" height="40" />
     </div>
    </div>
   </div>
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.imageconvolution-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数仅在与 GD 库捆绑编译的 PHP 版本中可用。</span></p></blockquote>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.imageconvolution-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="imagefilter.html" class="function" rel="rdfs-seeAlso">imagefilter()</a> - 对图像使用过滤器</span></li>
   </ul>
  </p>
 </div>

</div></div></div></body></html>